lim 200 (30-t)^2

Question

h->0

t=10

The answer should be -8000, but I keep getting -80,000 because I have to do it the long way.

Answer 1

200*20^2 = 200*400 = 80,000

if the answer is -8000 then there has been some mangling.

It seems clear that something is wrong, since ()^2 is always positive.